Shimmer cannot wrap ESM Modules

[joelnet]

When the package.json has type set to module, shimmer is unable to wrap functions.

I don't see a way to monkey patch an ESM project. This may just be limitation of ESM.

Node: 16.19.0, 20.10.0

Error:

/Users/jthoms/dev/shimmer-debug/node_modules/shimmer/index.js:13
  var enumerable = !!obj[name] && obj.propertyIsEnumerable(name)
                                      ^

TypeError: obj.propertyIsEnumerable is not a function
    at defineProperty (/Users/jthoms/dev/shimmer-debug/node_modules/shimmer/index.js:13:39)
    at Function.wrap (/Users/jthoms/dev/shimmer-debug/node_modules/shimmer/index.js:56:3)
    at file:///Users/jthoms/dev/shimmer-debug/src/app.js:4:9
    at ModuleJob.run (node:internal/modules/esm/module_job:193:25)
    at async Promise.all (index 0)
    at async ESMLoader.import (node:internal/modules/esm/loader:530:24)
    at async loadESM (node:internal/process/esm_loader:91:5)
    at async handleMainPromise (node:internal/modules/run_main:65:12)

package.json:

{
  "name": "shimmer-debug",
  "version": "1.0.0",
  "type": "module",
  "scripts": {
    "start": "node app.js"
  },
  "dependencies": {
    "shimmer": "^1.2.1"
  }
}

app.js

import shimmer from "shimmer";
import * as component from "./component.js";

shimmer.wrap(component, "fn", (original) => {
  return function () {
    console.log("!!!!!!!!!!!!!!!!!!!!!");
    return original.apply(this, arguments);
  };
});

component.fn();

component.js

export function fn() {
  console.log("component.fn()");
}